PixelDroid-App-Android/app/src/main/java/com/h/pixeldroid/fragments/FilterListFragment.kt

package com.h.pixeldroid.fragments

import android.graphics.Bitmap
import android.os.Bundle
import android.provider.MediaStore
import android.util.TypedValue
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.DefaultItemAnimator
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.h.pixeldroid.PhotoEditActivity
import com.h.pixeldroid.R
import com.h.pixeldroid.adapters.ThumbnailAdapter
import com.h.pixeldroid.interfaces.FilterListFragmentListener
import com.h.pixeldroid.utils.SpaceItemDecoration
import com.zomato.photofilters.FilterPack
import com.zomato.photofilters.imageprocessors.Filter
import com.zomato.photofilters.utils.ThumbnailItem
import com.zomato.photofilters.utils.ThumbnailsManager

class FilterListFragment : Fragment(), FilterListFragmentListener {

    internal lateinit var recyclerView: RecyclerView
    internal var listener : FilterListFragmentListener? = null
    internal lateinit var adapter: ThumbnailAdapter
    internal lateinit var tbItemList: MutableList<ThumbnailItem>

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val view =  inflater.inflate(R.layout.fragment_filter_list, container, false)

        tbItemList = ArrayList()
        adapter = ThumbnailAdapter(requireActivity(), tbItemList, this)

        recyclerView = view.findViewById(R.id.recycler_view)
        recyclerView.layoutManager = LinearLayoutManager(activity, LinearLayoutManager.HORIZONTAL, false)
        recyclerView.itemAnimator = DefaultItemAnimator()

        val space = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8f, resources.displayMetrics).toInt()
        recyclerView.addItemDecoration(SpaceItemDecoration(space))
        recyclerView.adapter = adapter

        displayImage(null)

        return view
    }

    fun displayImage(bitmap: Bitmap?) {
        val r = Runnable {
            val tbImage: Bitmap = (if (bitmap == null) {
                MediaStore.Images.Media.getBitmap(requireActivity().contentResolver, PhotoEditActivity.URI.picture_uri)
            } else {
                Bitmap.createScaledBitmap(bitmap, 100, 100, false)
            })
                ?: return@Runnable

            setupFilter(tbImage)

            tbItemList.addAll(ThumbnailsManager.processThumbs(activity))
            requireActivity().runOnUiThread{ adapter.notifyDataSetChanged() }
        }

        Thread(r).start()
    }

    private fun setupFilter(tbImage: Bitmap?) {
        ThumbnailsManager.clearThumbs()
        tbItemList.clear()

        val tbItem = ThumbnailItem()
        tbItem.image = tbImage
        tbItem.filterName = getString(R.string.normal_filter)
        ThumbnailsManager.addThumb(tbItem)

        val filters = FilterPack.getFilterPack(requireActivity())

        for (filter in filters) {
            val item = ThumbnailItem()
            item.image = tbImage
            item.filter = filter
            item.filterName = filter.name
            ThumbnailsManager.addThumb(item)
        }
    }

    override fun onFilterSelected(filter: Filter) {
        if(listener != null ){
            listener!!.onFilterSelected(filter)
        }
    }

    fun setListener(listFragmentListener: FilterListFragmentListener) {
        this.listener = listFragmentListener
    }
}